Species Details

Potamogeton zosteriformis

eel-grass pondweed

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Classification

Scientific Name: Potamogeton zosteriformis Fern.
Common Name: eel-grass pondweed
Family:	Potamogetonaceae
Element Code:	PMPOT03160
USDA Plants Symbol:	POZO
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S3
Other Status:
CRPR Changes: changed from 2.2 to 2B.2 on 2013-06-12
Add Date:	1994-01-01
Date Edited:	2021-05-26

Ecology and Life History

Lifeform: annual herb (aquatic)

Blooming Period: Jun-Jul

Elevation:
0 - 1860 meters
0 - 6105 feet

General Habitats:

Marshes and swamps (freshwater)

Microhabitat Details:

Microhabitat:

Notes

Notes: To be expected in the Central Valley; need information.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	7	35 %
Recreational use (non-ORV)	6	30%
Altered flood/tidal/hydrologic regime	2	10%
Degraded water quality	1	5%
Non-native plant impacts	1	5%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					20
A	B	C	D	X	U
0	6	1	0	0	13

Occurrence Status:
Historical >20 Years	13
Recent <=20 Years	7

Presence:
Presumed Extant	20
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Alaska (AK), California (CA), Connecticut (CT), Idaho (ID), Illinois (IL), Indiana (IN), Iowa (IA), Kansas (KS), Maine (ME), Maryland (MD), Massachusetts (MA), Michigan (MI), Minnesota (MN), Montana (MT), Nebraska (NE), New Hampshire (NH), New Jersey (NJ), New York (NY), North Dakota (ND), Ohio (OH), Oregon (OR), Pennsylvania (PA), South Dakota (SD), Utah (UT), Vermont (VT), Virginia (VA), Washington (WA), West Virginia (WV), Wisconsin (WI), Wyoming (WY)

California Counties and Islands: Name (Code)
Contra Costa (CCA), Lake (LAK), Lassen (LAS), Mariposa (MPA), Merced (MER), Modoc (MOD), Mono (MNO), Shasta (SHA)

Quads: Name (Quad Code)
Alturas (4112045), Benmore Canyon (3912215), Boles Meadows East (4112067), Bouldin Island (3812115), Burney Falls (4112116), Canby (4112047), Cassel (4012185), Clearlake Highlands (3812286), Clearlake Oaks (3912216), Dana (4112115), Egg Lake (4112133), Fales Hot Springs (3811934), Infernal Caverns (4112035), Jersey Island (3812116), Jess Valley (4112023), Kelseyville (3812287), Lower Lake (3812285), Lucerne (3912217), Merced Falls (3712053), Rattlesnake Butte (4112046), Washington Mtn. (4112048), Wendel (4012032)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Rare Plant Inventory